C-band to C+L band upgrades
A C-band to C+L band upgrade is a network capacity enhancement that
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integrates additional L-band optical channels alongside existing C-band channels,
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enables service providers to increase overall fiber bandwidth, and
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maintains the original C-band infrastructure, minimizing service interruptions during the upgrade.
| Feature Name | Release Information | Description |
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Nontraffic- Affecting C+L Band Upgrade |
Cisco IOS XR Release 26.1.1 |
You can now upgrade an existing C-band network to a C+L band network using C+L or C+L Futuristic Band Type, without affecting traffic flow. Cisco Optical Network Planner (CONP) computes the values for relevant parameters
in a C+L network configuration.
The C+L band upgrade allows you to add more bands to your network and increase its bandwidth. |
Key components of C+L band upgrade
These components work together during a C+L band upgrade:
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Cisco Optical Network Planner (CONP): Computes target PSD values and amplifier gain ranges for C-band and L-band devices; requires manual partner-band configuration through CLI.
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Partner-band port: Facilitates communication between C-band and L-band nodes by utilizing an available management port. To establish this connection, the management port IP addresses must be cross-configured on both nodes.
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Band Failure Recovery (BFR): Initiates the recovery procedure on the L-band node once end-to-end terminal connectivity is established.
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Link Tuner (LT) and Gain Estimator (GE): Ensures precise power level computation and transitions the PSD profile from Single Band to Dual Band.
Upgrade a C-band network to C+L band
Upgrade your optical network from C-band to C+L band to enable additional wavelengths and bandwidth, ensuring uninterrupted traffic flow during the transition.
Before you begin
 Note |
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Procedure
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Step 1 |
Upload CONP XML configuration files to both C-band and L-band devices by specifying the XML file location. Example: |
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Step 2 |
Establish connectivity between C-band and L-band devices. |
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Step 3 |
Ensure that the Link Tuner (LT) and Gain Estimator (GE) are enabled on both C-band and L-band devices. Example:Example: |
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Step 4 |
On the L-band BFR manager, band status remains NA until end-to-end connectivity is established. When the system discovers the end-to-end terminal (OLT-OLT), all agent nodes update their band status. BFR then initiates the BRING UP (RECOVERY) procedure and recovers nodes one at a time. Example:This example shows the output of the show olc band-status command where the L-Band recovery is not initiated and BFR status is NA. This example shows the output of the show olc band-status command where the L-Band recovery is in progress and BFR status is Running. |
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Step 5 |
Wait until recovery is complete on all nodes. Then, verify the PSD status of the C-band and partner L-band nodes to confirm that the PSD profile is DUAL BAND PSD. |
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Step 6 |
Verify that BFR has converged on all nodes and the state on the agent nodes are ACTIVE with DUAL BAND PSD. Check the traffic status on C-band nodes and confirm that traffic was not impacted during the L-band addition.. Example:This example shows the output of the show olc band-status command where the L-Band bring up is complete, PSD profile is DUAL BAND PSD, and band status of all the agent nodes is Active. |
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Step 7 |
Perform these tasks to verify the upgrade.
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The network now supports simultaneous operation of C-band and L-band wavelengths, resulting in improved bandwidth. This maintains continuous service and ensures that traffic remains uninterrupted during the upgrade.
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